| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.solr.analytics.facet; |
| |
| import java.util.function.Consumer; |
| |
| import org.apache.solr.analytics.function.ReductionCollectionManager.ReductionDataCollection; |
| import org.apache.solr.analytics.value.StringValueStream; |
| |
| /** |
| * A facet that breaks up data by the values of a mapping expression or field. |
| * The mapping expression must be castable to a {@link StringValueStream}. |
| */ |
| public class ValueFacet extends SortableFacet implements StreamingFacet, Consumer<String> { |
| private StringValueStream expression; |
| |
| public ValueFacet(String name, StringValueStream expression) { |
| super(name); |
| this.expression = expression; |
| } |
| |
| @Override |
| public void addFacetValueCollectionTargets() { |
| expression.streamStrings(this); |
| } |
| |
| @Override |
| public void accept(String t) { |
| ReductionDataCollection collection = reductionData.get(t); |
| if (collection == null) { |
| collection = collectionManager.newDataCollectionTarget(); |
| reductionData.put(t, collection); |
| } else { |
| collectionManager.addCollectTarget(collection); |
| } |
| } |
| |
| /** |
| * Get the expression used to create the facet values. |
| * |
| * @return a string mapping expression |
| */ |
| public StringValueStream getExpression() { |
| return expression; |
| } |
| } |